Dynamic reliable control strategy of high-capacity contactor

Abstract

The invention relates to a dynamic reliable control strategy of a high-capacity contactor. The dynamic reliable control strategy comprises the following steps of: by adopting a current closed loop as a basic inner loop, controlling the current inner loop by adopting a slope outer loop in a starting process, lowering the collision speed of a movable iron core, and reducing bounce of a contact terminal in the starting process; during a maintaining process, monitoring the outer loop by adopting error breaking, predicting an error breaking fault of the contactor, and taking a measure in time to prevent the error breaking; and during a breaking process, controlling the breaking speed of the movable iron core, so that not only can the rapid breaking of the contactor be guaranteed, but also the burning of the contact terminal caused by breaking electric arc is reduced, and the impact on a contactor framework during the breaking process is also reduced.

Description

technical field [0001] The invention relates to a dynamic and reliable control strategy for a large-capacity contactor. Background technique [0002] Since the country launched the policy of revitalizing the equipment manufacturing industry, my country's mining, metallurgy, lifting and other heavy equipment industries have developed rapidly, and equipment manufacturing capabilities have been greatly improved. With the large-scale processing equipment, the capacity requirements for supporting electrical products are also increasing. As the contactor is a low-voltage control electrical appliance commonly used in industrial production, the demand for its large-capacity products is even more urgent. Large-capacity contactors are mostly used in coal, mining, metallurgy, wind power, frequency conversion, locomotives, ships and other heavy equipment fields to control the on-off of important large-capacity circuits. In view of the harsh working environment of these industries and the...

AI Technical Summary

Problems solved by technology

The current closed-loop control technology overcomes many defects in the operation of traditional large-capacity contactors and improves the overall performance of the product, but there are still many difficult problems to be solved. For example, at present, the electrical life of large-capacity contactors is often only tens of thousands Second, compared with the electrical life of a small-capacity contactor of one million times, there is still a large room for improvement; the current closed-loop control technology of the current will lose control when the operating environment of the contactor is subject to harsh conditions such as vibration and impact : Because when the external impact force is applied, the air gap between the moving and static iron cores will increase, and the coil current will be forced to rise, which is greater than the reference current. At this time, the current closed loop will fall into a "vicious cycle", which will aggravate the breaking process and limit its use in locomotives and ships. Applications in severe vibration occasions such as driving, driving, etc.; when a large-capacity contactor is broken, the large spring reaction force will cause a serious impact on the frame by the moving iron core, reducing the mechanical life of the contactor

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